The 'work so far' pic seems to be cut off at the bottom.
There appears to be a contradiction in the original test question, the 5.12a IS using a N.C. stop P.B
i.e. they label A as a N.O. P.B. but it is shown as a N.C.?? https://www.schneider-electric.ca/en/download/document/0140CT9201/
Max.